what the hell is a nug i keep hearin people say it but i dunno what it means. im good on most other words its just this one i got trouble with.
1 Improper use of contact lenses or steroid eyedrops can lead to fungal infections, which in turn can cause corneal ulcers. Also, a corneal injury that results in plant material getting into the eye can lead to fungal keratitis.  Acanthamoeba are microscopic, single-celled amoeba that can cause human infection.
Next is the stroma, which comprises most of the thickness of the cornea. The innermost layer is called Descemet's membrane. Causes of Corneal Ulcers Corneal ulcers are wounds to the cornea usually caused by an abrasion, scratch, puncture or other trauma to the eye. Brachycephalic breeds are more prone to corneal ulcers than breeds with normal facial and eye construction. 2  Symptoms of a corneal ulcer can include squinting or pawing at the eye, watery eyes, sensitivity to light, and a red, inflamed, painful appearance to the eye.